}
	default:
		if r.Name.Kind == "func" {
			error_(r.Pos(), "must call C.%s", fixGo(r.Name.Go))
		}
	}
	return expr
}

// gofmtPos returns the gofmt-formatted string for an AST node,
// with a comment setting the position before the node.
func gofmtPos(n ast.Expr, pos token.Pos) string {
	s := gofmtLine(n)
	p := fset.Position(pos)
	if p.Column == 0 {
		return s